[src/trunk]: src/sys/arch/x86/x86 Introduce pmap_bootstrap_valloc and pmap_bo...

[maxv <maxv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2eebc00dcf21
branches:  trunk
changeset: 816347:2eebc00dcf21
user:      maxv <maxv%NetBSD.org@localhost>
date:      Fri Jul 01 11:28:18 2016 +0000

description:
Introduce pmap_bootstrap_valloc and pmap_bootstrap_palloc, that are used
to allocate a virtual/physical address before the VM system has been set
up.

Start using it.

diffstat:

 sys/arch/x86/x86/pmap.c |  56 ++++++++++++++++++++++++++++++++++++------------
 1 files changed, 42 insertions(+), 14 deletions(-)

diffs (107 lines):

diff -r 609f37cb9615 -r 2eebc00dcf21 sys/arch/x86/x86/pmap.c
--- a/sys/arch/x86/x86/pmap.c   Fri Jul 01 11:20:01 2016 +0000
+++ b/sys/arch/x86/x86/pmap.c   Fri Jul 01 11:28:18 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.c,v 1.199 2016/07/01 11:20:01 maxv Exp $  */
+/*     $NetBSD: pmap.c,v 1.200 2016/07/01 11:28:18 maxv Exp $  */
 
 /*-
  * Copyright (c) 2008, 2010 The NetBSD Foundation, Inc.
@@ -171,7 +171,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.199 2016/07/01 11:20:01 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.200 2016/07/01 11:28:18 maxv Exp $");
 
 #include "opt_user_ldt.h"
 #include "opt_lockdebug.h"
@@ -1179,6 +1179,34 @@
  */
 
 /*
+ * pmap_bootstrap_valloc: allocate a virtual address in the bootstrap area.
+ * This function is to be used before any VM system has been set up.
+ *
+ * The va is taken from virtual_avail. 
+ */
+static vaddr_t
+pmap_bootstrap_valloc(size_t npages)
+{
+       vaddr_t va = virtual_avail;
+       virtual_avail += npages * PAGE_SIZE;
+       return va;
+}
+
+/*
+ * pmap_bootstrap_palloc: allocate a physical address in the bootstrap area.
+ * This function is to be used before any VM system has been set up.
+ *
+ * The pa is taken from avail_start. 
+ */
+static paddr_t
+pmap_bootstrap_palloc(size_t npages)
+{
+       paddr_t pa = avail_start;
+       avail_start += npages * PAGE_SIZE;
+       return pa;
+}
+
+/*
  * pmap_bootstrap: get the system in a state where it can run with VM
  *     properly enabled (called before main()).   the VM system is
  *      fully init'd later...
@@ -1187,7 +1215,6 @@
  *     a PDP for the kernel, and nkpde PTP's for the kernel.
  * => kva_start is the first free virtual address in kernel space
  */
-
 void
 pmap_bootstrap(vaddr_t kva_start)
 {
@@ -1196,7 +1223,6 @@
        int i;
        vaddr_t kva;
 #ifndef XEN
-       pd_entry_t *pde;
        unsigned long p1i;
        vaddr_t kva_end;
 #endif
@@ -1318,6 +1344,8 @@
 
 #ifdef __HAVE_DIRECT_MAP
 
+       pd_entry_t *pde;
+
        tmpva = (KERNBASE + NKL2_KIMG_ENTRIES * NBPD_L2);
        pte = PTE_BASE + pl1_i(tmpva);
 
@@ -1485,18 +1513,18 @@
        virtual_avail += 3 * PAGE_SIZE;
        avail_start += 3 * PAGE_SIZE;
 #else /* XEN */
-       idt_vaddr = virtual_avail;                      /* don't need pte */
-       idt_paddr = avail_start;                        /* steal a page */
+
 #if defined(__x86_64__)
-       virtual_avail += 2 * PAGE_SIZE;
-       avail_start += 2 * PAGE_SIZE;
-#else /* defined(__x86_64__) */
-       virtual_avail += PAGE_SIZE;
-       avail_start += PAGE_SIZE;
+       idt_vaddr = pmap_bootstrap_valloc(2);
+       idt_paddr = pmap_bootstrap_palloc(2);
+#else
+       idt_vaddr = pmap_bootstrap_valloc(1);
+       idt_paddr = pmap_bootstrap_palloc(1);
+
        /* pentium f00f bug stuff */
-       pentium_idt_vaddr = virtual_avail;              /* don't need pte */
-       virtual_avail += PAGE_SIZE;
-#endif /* defined(__x86_64__) */
+       pentium_idt_vaddr = pmap_bootstrap_valloc(1);
+#endif
+
 #endif /* XEN */
 
        /*